WebSocket client & server library, WAMP real-time framework
Project description
WebSocket & WAMP for Python on Twisted and asyncio.
Introduction
Autobahn|Python is a subproject of Autobahn and provides open-source implementations of
for Python 2 and 3, and running on Twisted and asyncio.
You can use Autobahn|Python to create clients and servers in Python speaking just plain WebSocket or WAMP.
WebSocket allows bidirectional real-time messaging on the Web and beyond, while WAMP adds real-time application communication on top of WebSocket.
WAMP provides asynchronous Remote Procedure Calls and Publish & Subscribe for applications in one protocol running over WebSocket. WAMP is a routed protocol, so you need a WAMP Router to connect your Autobahn|Python based clients. We provide Crossbar.io, but there are other options as well.
Features
compatible with Python 2.7 and 3.3 or later
runs under Twisted and asyncio - implements WebSocket RFC6455 and Draft Hybi-10+
implements WebSocket compression
implements WAMP, the Web Application Messaging Protocol
high-performance, fully asynchronous implementation
best-in-class standards conformance (100% strict passes with Autobahn Testsuite: Client <http://autobahn.ws/testsuite/reports/clients/index.html>__ Server)
message-, frame- and streaming-APIs for WebSocket
supports TLS (secure WebSocket) and proxies
Open-source (MIT license)
Show me some code
To give you a first impression, here are two examples. We have lot more in the repo.
WebSocket Echo Server
Here is a simple WebSocket Echo Server that will echo back any WebSocket message received:
from autobahn.twisted.websocket import WebSocketServerProtocol
# or: from autobahn.asyncio.websocket import WebSocketServerProtocol
class MyServerProtocol(WebSocketServerProtocol):
def onConnect(self, request):
print("Client connecting: {}".format(request.peer))
def onOpen(self):
print("WebSocket connection open.")
def onMessage(self, payload, isBinary):
if isBinary:
print("Binary message received: {} bytes".format(len(payload)))
else:
print("Text message received: {}".format(payload.decode('utf8')))
# echo back message verbatim
self.sendMessage(payload, isBinary)
def onClose(self, wasClean, code, reason):
print("WebSocket connection closed: {}".format(reason))To actually run above server protocol, you need some lines of boilerplate.
WAMP Application Component
Here is a WAMP Application Component that performs all four types of actions that WAMP provides:
subscribe to a topic
publish an event
register a procedure
call a procedure
from autobahn.twisted.wamp import ApplicationSession
# or: from autobahn.asyncio.wamp import ApplicationSession
class MyComponent(ApplicationSession):
@inlineCallbacks
def onJoin(self, details):
# 1. subscribe to a topic so we receive events
def onevent(msg):
print("Got event: {}".format(msg))
yield self.subscribe(onevent, 'com.myapp.hello')
# 2. publish an event to a topic
self.publish('com.myapp.hello', 'Hello, world!')
# 3. register a procedure for remote calling
def add2(x, y):
return x + y
self.register(add2, 'com.myapp.add2');
# 4. call a remote procedure
res = yield self.call('com.myapp.add2', 2, 3)
print("Got result: {}".format(res))Above code will work on Twisted and asyncio by changing a single line (the base class of MyComponent). To actually run above application component, you need some lines of boilerplate and a WAMP Router.
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